You can modify the Wii's Smash Bros. to play differently, sure, but you can also mod it to look differently, using existing models as templates to introduce a whole range of new characters to the game.

Samba Di Amigo? He's there. Woody and Buzz from Toy Story? They're there. Carl from Up? Yup. There's even a Sackboy and a Stormtrooper rounding out the bootleg inclusions.